Detachable shoe for brake drums



1929. R. L. AUMACK 1,730,492

DETACHABLE SHOE FOR BRAKE DRUMS Filed Jan. 26, 1928 2 Sheets-Sheet l I I I I,

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ATTORNEY Oct. 8, 1929. Au AcK 1,730,492

DETACHA BLE SHOE FOR BRAKE DRUMS Filed Jan. 26, 1928 2 Sheets-Sheet 2 I l *IWIHHI! s I l i II M a! i a iv Q. Li;

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A TTORNEY S.

Patented Get. 8, 1929 Q v r lfl fiiiz I RAYMOND L. Jimenez, or nosnnrn, new JnnsnY DETAGHABLE snon ronrnannl names Application filed. January '26, 1928. Serial No. 249,514.

This invention relates to brake drums and a complete assemblage, parts being broken more particularly types employed on the away to disclose the construction, transmission shafts or axles of motor vehi- The hubs shown are preferably made of cles, the same being an improvement over my steel castings having a cylindricalout-er end co-pending application for patent on Brake 5 and a slightly enlarged body, 6 through drum for motor vehicles, filed August 13, which is bored a tapered axial opening 7'to v 1927, Serial Number 212,624. receive thecorrespondingly coned ends 25 of In brake drums of ordinary type it is cusa connecting shaft 26, held by ca-stelled nuts tomary to cast the drum with an integral hub 27 at their inner end and prevented from connected by spokes which frequently conturning by a spline 28 fitting the key-way 8 so tain flaws or cracks, due to the unequal strains in the bore. n i imposed in cooling of the metal. I lhe opposite end of the hub body may be Aside from this it is a matter of considerexpanded to form a hollow cone terminating able difficulty to produce a true axial bore in in an annular'flange 10 having a. flat counterthe hub, concentric with the periphery of the bored face 11 to engage a mating member 29 e5 drum, which must be in balance within a fair in a manner to drive the same, holes 12'being degree of accuracy. provided fo-rbolts 30 to draw such members The main disadvantage is however in the into intimate'rigid relation. I fact that when the drum becomes worn to a Midway in the length of the hub body 6 is state of questionable safety, it must be wholly another annular outstanding flange 14, which 70 discarded and another fitted in its place. may contain openings 15 to reduce'wei'g'ht,

It is therefore an important object of the the outer portion of the flange being thick present invention to provide a brake drum ened and faced, while its periphery is finand a flanged hub detachably engaged thereished to a predetermined diameter, this thickin, thus permitting ready renewal of worn ened portion being provided with bolt holes or damaged parts. "as indicated. I i

A further feature is inthe provision of Obviously the hub maybe machine finbrake drums or shoes, standardized to the ished all over if desired and can be accuextent of being interchangeably secured upon rately balanced, all parts being symmetrical.

a hub subject to substantially no wear, there- The drum consists of a cylindrical casting so by effecting a high degree of economy, re- 16, machinedtruly round on its face,itsedges placement of the drumbeing a simple and being also rendered smooth and level. relatively inexpensive matter. An inreaching flange 17 is faced upon said Another feature is to provide means for side 18 at least, thefiange being to one side supporting the brake mechanism on the hubs of the center of the length of the cylinder, the 85 of the brake drum in a manner to exclude longer side 19 being thickened and accurately dust and maintain proper lubrication. bored to receive the hub flange 1a which is These advantageous objects are 'accomdrawn againstthe drum flange 17 by'a pluplished by the novel design, construction and rality ofbolts 20 provided with nuts and lock 40 arrangement of parts hereinafter described Washers as shown. v and illustrated in the accompanying draw- From the foregoing it will be seen that ing, forming a component of this disclosure, when the drum 16 becomes worn or disabled; and in which the bolts 20 may be taken out,releasingthe Figure 1 is a transverse sectional view of drum and flange to be replaced by a new one,

an embodiment of the improved brake drum, the bore 19 and holes for the bolts '20 being the section being taken on line 1-1 of Fig maintained to gage whereby interohangev ure 2. ability isassured, and it will be apparent Figure 2 is an end view of the same,-lookthat the cost of such replacement is far less ing from the flanged end of the hub. than that of an integral drum and hub.

Figure 3is aside elevational view showing In the general assembly view shown in Ice Figure 3, driving and driven shafts respectively 31 and 32 are indicated as being connected by the bolts and mounted on the central cylindrical portion of the shaft 26 is an annular anti-friction bearing 32 carrying a frame 33 used in supporting and guiding brake elements of the usual type.

A cage 34, forming part of the frame encircles the bearing 32 and secured on opposite sides of the cage are plates 35 provided with openings to receive the inreaching ends of the hubs 5, which as before noted are smoothlymachined. h a

Set inthe thickened marginal portion of the plates surrounding the openings are packings 36, hearing directly upon the surfaces of the hubs, thus'acting to prevent the egress of any lubricant applied to the bearing and also the entrance of dust and grit to the bearing, thereby prolonging its usefulness.

It is to be understood that the specific shape of the hub body, bore or connection is v immaterial, depending upon existing conditions and also the relative sizes and proportions vary from those shown Without departingfrom the spirit of the invention as denoted by the appended claims.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent, is l l. A brake drum comprising a cylinder having a bore and a faced internal flange at the end of the bore, a hub having axial means tovreceive ,a drive shaft and connections to engage a mating member, an outreaching annular flange on said hub to fit the bore of said cylinder, and clamping means to draw said flanges into rigid relation.

2. A brake drum :comprising a hollow cylindrical body having an inreaching flange offset from the center, said body being interiorly thickened adjacent its flange on the longer side, .said thickened portion being bored and said flange faced, a hub having an axial bore and being of a length at least equal to the length of said cylinder, an annular outstanding flange on said hub close fitted to the cylinder bore and faced to seat against the face of the cylinder flange, an'd'a plurality of bolts to clamp said flanges rigidly together.

3. A brake drum comprising a cylinder having a bore and a faced internal flange at the end of the bore, a hub constituting one element of a drive shaft having an axial bore throughout the greater part of its length, a'

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hollow conical element terminating in a faced flange on said hub beyond the bore, an outstanding flange midway its length, said flange fitting the bore of said cylinder, and removable means to retain engagement. e

4:. The combination with a pair of brake drums, outstanding annular flanges on which said drums are removably engaged, said flanges havlng elongated hubs extending into said flanges in rigid proximity pastthe edge-s of said drums and containing conical bore-s, a shaft fitted to said 5. The combination with a pair of brake drums, outstanding annular flange-s on which said drums are removably engaged, said flanges having elongated hubs extending into proximity past the edges of said drums and containing conical bores, a shaft fitted to said hubs, means to secure the shaft therein, flanges on the opposite ends of said hubs to extend at least flush with the outer edges of said drums, a driving'and a driven shaft removably engaged with the respective flanges, a connecting shaft fixed in the adjacent ends of the hubs, brake mechanism including an anti-friction bearing mounted on said connect-ing shaft, side plates at the bearing, said plate having an .annularly recessed opening, and packings in the recesses to bear upon the inreaching ends of said hubs. This specification signed this 18th day of January, 1928.

' RAYMOND L. AUMACK. 

